Ceiling drill-press.



F. A. ERHINGTON.

CEILING DRI LL PRESS. APPLIQATION FILED JAN.4. 1916.

1,226,479 Patented May15, 1917.

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FRANKLIN A. ERRINGTON, OF STAPLETON, NEW YORK.

CEILING DRILL-PRESS.

Specification of Letters Patent.

Patented May 15, 191%.

Application filed January 4, 1916. Serial No. 70,281.

To all whom it may concern:

Be it known that I, FRANKLIN ALFRED ERRINGTON, a citizen of the United States of America, residing at Stapleton, borough and county of Richmond, city and State of New York, have invented certain new and useful Improvements in Ceiling Drill- Presses, of which the following is a specification.

This invention relates to an inverted drill press for the purpose of drilling, tapping, stud-setting, etc, in all classes of overhead work, such as between decks in ships, in steel beams of buildings, etc. 7 s

The main object of this invention is to keep the motor and the weight of the outfit as close to the base as possible, thereby making the machine practical for the sensitive operation of tapping; whereas, all pre-' vious devlces have earned the motor soT high, or in such a position as to cause such excessive vibration, as to be unfit for, and cause breakage of taps when attempting to use such an outfit for tapping; moreover, my machine has a double-feed control, as a tap must be controlled while being fed in, and also while being backed out; and my invention further consists in the embodying in a compact and novel structure all the constant elements required in such operations,- as will be more fully hereinafter set forth, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming part hereof, where- 1n:

Figure 1 represents a vertical cross-section of a machine embodying my invention; Fig. 2 is a horizontal cross-section of Fig. 1 showing the gearbox in section on the line 22 on Fig. 1, and illustrating the feed mechanism with its duplex control, and a ratchet to check the downward movement of the rack-sleeve.

Similar numerals and letters of reference indicate corresponding parts in the several views.

A base 1 is provided with uprights 2, 3, 4, 5 that rigidly support a gear-box 6 at a suitable distance above the base 1 to permit the interposition of a motor 7 provided with a rotary-driving sleeve 8. The gear-box 6 is provided with a main-bearing 6 in line with said rotary-driving sleeve 8 and adapted to receive a rack-sleeve 9, longitudinally movable in said main bearing 6, and held from rotation therein by its rack-teeth intermeshing with the teeth of a feed-gear 10 connected to rotate with a feed-shaft 11, journaled in said gear-box 6 at right angles to the line of travel of said rack-sleeve 9. A spindle 12 is journaled in rack-sleeve 9 and suitably secured to be moved longitudinally in unison therewith,-say by an enlarged tool-carrying end l2 bearing upon one' end of said rack-sleeve, and lock-nuts 12 bearing upon the other end thereof. The other end 12 of spindle 12 is shown telescoping into the rotary-driving sleeve 8 and rotary-driven thereby through the usual groove in spindle 12 and a key in sleeve 8, or any suitable slip-joint connection.

On one side of gear-box 6 I have mounted a pinion 13 keyed to feed-shaft 11 and adapted to engage a ratchet 14, suitably carried by the framework of the machine and adapted to check the downward movement of the spindle 12, while leaving it free to be fed upward. On the other side of gear-box 6 I have keyed to the other end of feed shaft 11 another feed-gear 15, adapted to engage the teeth out in the end of a doubleacting spring-clutch 16, journaled in a swing-joint 17, into which I have screwed a hollow feed-handle 18, up the hollow of which I have run a rod 19 to connect a pullknob 20 with the spring-catch 16. A slot 18 permits a pin 20 to sink into the handle 18 far enough to permit the spring-clutch 16 to engage the feed-gear 15 to enable handle 18 to move the rack-sleeve 9 and its spindle 12 up or down as desired. The ratchet 14 holds the spindle 12 in place while the pin 20 is withdrawn from slot 18 and pull-knob 20 has been rotated, to uncouple the spring-clutch 16 from gear 15. The handle 18 can then be moved up or down by the operator (independently of feedgear 15 and the feed mechanism generally), and thereby raise or lower the spindle 12 throughout its entire longitudinal range of travel, by taking a fresh grip on feed-gear 15 whenever any single grip has been exhausted.

It will be seen that one of the uprights, 5, is extended above the gear-box 6 to provide a supporting column for the reverse rod 21 of a suitable reverse-gear box or attachment 22, which may be attached to spindle 12 whenever it is desired to tap with my machine. The column 5 is also useful as a lever or handle when tipping the machine to one side to bring the truck-wheels 23 in contact with the floor to run the machine therealong from place to place where the work is to be performed. When the base 1 stands flat on the floor, the truck-wheels 23 are raised clear of the floor, so that the base-rests rigidly thereupon.

The operation of the machine is as fol- Current is supplied to the motor by any suitable or usualmeans, a drill (of any suitable length) is placed in the socket 22 of the reversible spindle of the reverse'g'ear box or -tapping attachment 22, the handle 18 is'then lowered, to raise the drill up until itpresses firmly against the center-punch or other suitable location to be drilled, whereupon =t'he operator pushes a suitably arranged switch to start the motor '7, which rotates spindle 12 and the drill that is driven there'by. Continued pressure on handle 18 feeds the drill into the work operated upon until the desired depth is attained,

whenthe operator'throws out the ratchet 14:

before raisingthe handle 18; the handle '18 is 'then raised and the drill can be withdrawn, although it is advisable to switch off the motor before withdrawing the drill from the support of the hole in the work, especially when using a'long'extension drillshaft. The drill is then taken out, and a tap 24 substituted in its place in socket 22, the motor is switched on, and the tap is fed into the hole thus prepared, the ratchet 1 1 ,being kept off during the entire tapping opbearing extending in line with said rotarydriving sleeve, a non-rotative rack-sleeve longitudinally movable in said main-bearing, its rack meshing with a feed-gear suitably journaled in said gear-box atright angles to the line of travel of said rack-sleeve,

2 of the motor, one portion of the spindle being suitably journaled in said rack-sleeve to move longitudinally in unison therewith along the main-bearing ofthe gear-box, the

lower portion of the spindle being connected by -a slip-joint with the rotary-driving sleeve to be driven thereby and longitudinally movable therealong, and the upper end of the spindle being adapted to receive a tool or-tool--holder, substantially as described.

2. The combination with a portable base and a motor mounted thereon and provided with a rotary-driving sleeve,"of a gear-box rigidly supported at a constant distance above saidbase and provided with a mainbearing-extending in line with said rotarydriving sleeve, a non-rotative' raclrsl'eeve longitudinally movable in said 'main-be'aring, its rack meshing with a feed-gear connected'to rotate with a feed-shaft journaled in said gear-box at rightangles to :the line of travel of said rack-sleeve, means *to rotate said feed-gear to movesaid rack-sleeve down toward or up away from said base, a ratchet to check the downward movement while permitting-the upward movement of said rack-sleeve, and a rotary driven longitudinally movable spindle extending in line with the axis of the motor, one portion bf the spindle being suitably journaled in said rack-sleeve to move longitudinallyin' unison therewith alongthe main-bearing of the gear-box, the lower portionofthe spindle being connected by a slip-joint with the rotary-driving sleeve to be driven thereby and longitudinally movabletherealong, the upper end of the spindle being adapted to receive a tool or tool-holder, substantially as described.

3. The combination with a portable base and a motor mounted thereon and provided with a rotary-driving sleeve, of'a plurality ofuprights extending above the baseto rigidly support a gear-box at a constant distance thereabove, said gear-box being provided with a main-bearing in line withsaid rotary-driving sleeve, 21. non-rotative racksleeve longitudinally -movable in the mainbearing, its rack'meshingwith a feed-gear mounted upon and connected to rotate with a feed-shaft journaled in the gear-box at right angles to the line of travel of'the racksleeve, means to rotate the feed-gear to move the rack-sleeve along the main-bearing, and a rotary-driven longitudinally movable spindle extending in line with the axis of the motor, one portion of'the spindle bei'n'g suitably journaled in the rack-sleeve to move longitudinally in unisontherewith along .the main-bearing, the lower portion 'of' the spindie being connected by a slip-joint with rod of a suitable reverse-gear box carried by said rotary-driving sleeve to turn therewith said spindle, substantially as described.

and slide therealon the upper end of the spindle being adapted to receive a tool or FRANKLIN ERRINGTON holder, one of said uprights being extended Witnesses: sufiiciently above the gear-box to provide a F. J. GoomucK, supporting-column to receive the reverse- L. E. MANNING.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

